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RISS 인기검색어
- 검색키워드
- 저자 : ( Gaurav Pande ) (검색결과 3 건)
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( Gaurav Pande ),박종승 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
In the present study, we have prepared alkylated and perfluorinated viologens as electrochromic species, and examined the electrochromic behaviors of electrochromic gel compositions, made up of poly (vinylidene fluoride-co-hexafluoropropylene), as conductive electrolyte, and 1-butyl-3-methylimidazolium bis(trifluorosulfona)imide, as room temperature ionic liquids. In order to lower the operation voltage, Ferrocene was added as an anodic species. We have designed and synthesized several different types of viologen derivatives containing symmetrical and unsymmetrical combinations of alkylated and perfluorinated substituents. The prepared electrochromic gel were sandwiched between two ITO coated glass slides and the electrochemical properties have been measured and compared, in terms of cyclic voltammetry, spectroelectrochemistry, and optical density. Detailed, experimental results will be presented in the poster.
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Effects of counter ions on electrochromic behaviors of asymmetrically substituted viologens
Pande, Gaurav K.,Kim, Namhyeon,Choi, Jin Hui,Balamurugan, Gopal,Moon, Hong Chul,Park, Jong S. North-Holland 2019 Solar Energy Materials and Solar Cells Vol. No.
<P><B>Abstract</B></P> <P>We present effects of counter anions on electrochromic behavior of asymmetrically substituted viologens, 1-hexyl-1′-nonafluorohexyl viologens (HERFVs). For this purpose, two anions, hexafluorophosphate ([PF<SUB>6</SUB>]<SUP>–</SUP>) and bis(trifluorosulfonyl)imide ([TFSI]<SUP>–</SUP>), were employed for both HERFVs and 1-butyl-3-methylimidazolium ([BMIM]<SUP>+</SUP>)-based ionic liquids. The HERFV-containing electrochromic devices (ECDs) exhibited apparent dependence on the counter ions in terms of optical contrast, switching speed, long-term cyclic stability, coloration efficiency, and memory effect. Specifically, the ECDs based on [HERFV][PF<SUB>6</SUB>]<SUB>2</SUB> showed a redox response at −1.0 V with a color change from colorless to blue. Meanwhile, the coloration of [HERFV][TFSI]<SUB>2</SUB> appeared at −3.0 V, and a significantly long optical memory effect was observed with unstable cyclic repeatability. We attributed this discrepancy to the nature of counter ions, such as size and electronegativity, which may influence the electron transfer process during redox reactions. These results demonstrated that counter anions can exert a significant impact on the EC behaviors of asymmetrically substituted viologens. The presented approach suggests a potential tool for controlling EC properties of viologen derivatives for applications in transmissive windows and eye wear.</P>
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최준홍,( Pande Gaurav Kiranrao ),박종승 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Electrochromic devices (ECDs) exhibits color change reversibly on applying an external potential. Viologen derivatives were frequently employed as an electrochromic material in ECDs owing to their simple molecular structure and simple synthetic modification. However, viologens have often suffered from significant drawbacks, such as inferior coloration efficiency, low switching speed, and reduced long-term stability. As for electrodes, there have been various attempts for transparent conducting electrodes (TCEs) were investigated. As a measure to effectively address these issues, here we present the use of octa-hexyl viologen substituted polyhedral oligomeric silsesquioxane as an electrochromic material. The TCE compositions were prepared by the mixture of silver nanowire and PEDOT:PSS and then spray-coated on the plastic substrate. The electrochromic performances of the plastic ECDs were investigated in terms of cyclic voltammetry, spectroelectro-chemistry, and kinetic stability.
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